Tein GSAA6-8UAS2 Street Basis Z Coilovers 2017-2021 Honda Civic FK7 FWD Hatch

Vehicle Fitment

• 2017-2021 Honda Civic (FK7, 5-Door Hatchback, FWD, 1.5L L15B7 Turbo 4-Cylinder)

Fitment Notes

• Does NOT fit the Honda Civic Type R (FK8) - Civic Type R requires a separate Tein application
• Does NOT fit the Honda Civic Sedan (FC1/FC2) or Civic Coupe (FC3) - 5-Door Hatchback (FK7) body style only
• Front strut fitment is exclusively for vehicles with a 52.0mm diameter OEM strut - verify before purchase
• FWD only - this application is not offered for AWD configurations as the FK7 is FWD-only
• OEM upper mounts (top hats) must be reused - this kit does not include new upper mounts
• Camber adjustment is not available with this kit - OEM geometry is retained at the top mount
• Damping force adjustment is not available - damping is fixed and factory-set by Tein
• This kit does not fit the 2022+ Honda Civic (11th generation)

Features

• Height-adjustable coilover system - threaded lower collar and spring seat allow ride height to be set to the user's preference within the lowering range
• Twin-tube damper construction delivers longer stroke with reduced repulsive force compared to mono-tube designs, resulting in superior daily-use ride comfort while maintaining sporty handling
• Shortened shell case design provides optimum damper stroke at lowered ride heights, preserving suspension travel even when the vehicle is set low
• ZT-coated threaded sleeve resists corrosion and allows smooth, consistent collar adjustment over the lifetime of the kit
• Delrin spring seat washer allows the lower seat to spin freely beneath the spring, reducing spring bind during adjustment and use
• SAE9254 cold-formed springs with a minimum tensile strength of 200 kgf/mm² are sag-proof and highly resilient over long-term use
• Powder-coated spring finish is durable, chip-resistant, and corrosion-resistant in all conditions
• Fixed damping tuned by Tein engineers to balance daily ride compliance with sharp, controlled cornering response - no user adjustment required
• Ergonomic long-handled adjustment wrenches with flanged collars included - prevent wrench slip during height adjustment
• Fully sealed damper structure for improved durability and reduced maintenance requirements
• Manufactured in Japan under strict Tein quality control standards
• Compatible with Tein EDFC motor kit for remote damping monitoring (note: damping adjustment is not active on this non-adjustable kit)

Specifications

• Part Number: GSAA6-8UAS2
• Product Line: Street Basis Z (SBZ)
• Part Type: Coilover Damper Kit (Full Set - Front and Rear)
• Vehicle Platform: Honda Civic FK7 (5-Door Hatchback, FWD)
• Damper Type: Twin-Tube
• Damping Adjustment: Fixed (Non-Adjustable)
• Height Adjustment: Yes - Threaded Collar (Lower Spring Seat)
• Front Lowering Range: -25mm to -70mm (-0.9 in. to -2.8 in.) from stock
• Rear Lowering Range: -25mm to -80mm (-0.9 in. to -3.2 in.) from stock
• Recommended Drop Range: Approximately 38mm to 50mm (1.5 in. to 2.0 in.)
• Spring Rate (Front): 5 kgf/mm (280 lb/in)
• Spring Rate (Rear): 5 kgf/mm (280 lb/in)
• Spring Material: SAE9254 Cold-Formed Steel (Min. 200 kgf/mm² Tensile Strength)
• Spring Finish: Powder Coated
• Sleeve Coating: ZT (Corrosion Resistant)
• Upper Mounts: OEM Reuse Required (Not Included)
• Position: Front and Rear (Full Kit - 4 Dampers)
• Drivetrain: FWD
• Quantity: 4 (Complete Set)
• Country of Manufacture: Japan
• Warranty: 1-Year Limited (through authorized Tein dealers)

Included Components

• 2x Front Coilover Assemblies (Left and Right)
• 2x Rear Coilover Assemblies (Left and Right)
• 1x Set of Adjustment Wrenches (Ergonomic Long-Handle, Flanged)
• 1x Delrin Spring Seat Washers
• 1x Installation Hardware

Product Description

The Tein Street Basis Z (Part #GSAA6-8UAS2) is an entry-level height-adjustable coilover kit engineered specifically for the 2017-2021 Honda Civic FK7 5-Door Hatchback (FWD, 1.5L). Designed as the logical progression beyond lowering springs, the Street Basis Z gives FK7 owners the ability to dial in their exact preferred ride height via threaded lower collars and spring seats, while eliminating the guesswork of mixing spring brands with unmatched dampers. Tein selects spring rates and valves each Street Basis Z damper together as a matched system - the 5 kgf/mm (280 lb/in) rate front and rear is conservatively tuned for daily usability, with damping calibrated to manage highway undulations without unsettling the chassis while still delivering sharper cornering response than the factory setup.

The twin-tube damper architecture is central to the Street Basis Z's daily-driver character. Compared to mono-tube designs, twin-tube construction achieves longer stroke with lower initial repulsive force, which translates directly to superior ride comfort over rough surfaces, speed bumps, and urban road imperfections - even when the car is set significantly lower than stock. The shortened shell case design preserves useful damper stroke at reduced ride heights, so the car doesn't become harsh or bottomed-out when adjusted within the recommended 1.5" to 2.0" drop range. The ZT-coated threaded sleeve and Delrin spring seat washer reduce friction and binding during height adjustments, and the included ergonomic long-handled flanged wrenches make collar adjustments significantly easier than standard suspension tools allow.

Important fitment notes: This kit is designed exclusively for the FK7 Hatchback with a 52.0mm diameter OEM front strut - the Civic Type R (FK8), Civic Sedan (FC1/FC2), and Civic Coupe (FC3) all require separate Tein applications. OEM upper mounts must be reused and are not included with this kit. Damping force is fixed and not user-adjustable on this kit. Manufactured in Japan to Tein's strict quality standards and backed by a 1-year limited warranty through authorized Tein dealers, the Street Basis Z is the ideal first coilover system for FK7 owners seeking a quality ride height solution without the cost or complexity of a fully adjustable setup.